Dental implant research has been mostly concerned with the biocompatibility of materials for implantation. In this study the effects of titanium dioxide and other metallic salts on seven bacterial species commonly found in dental plaque, two which are uncommon, and a yeast, were determined by agar incorporation and diffusion techniques, and compared with the effects of a titanium implant abutment. Neither the titanium dioxide nor the implant abutment demonstrated any inhibitory activity, although other compounds such as cobalt used in dental alloys had some effects.


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